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author | Guoqing Jiang <gqjiang@suse.com> | 2015-12-21 00:51:00 +0100 |
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committer | NeilBrown <neilb@suse.com> | 2016-01-06 01:39:10 +0100 |
commit | 15858fa5b00c1067a8a8e53ea32f4a65f8bebbb8 (patch) | |
tree | e44bdb5eba07e589d43ef66725d3d0dfa45c4f4d /drivers/md/md.h | |
parent | md-cluster: update the documentation (diff) | |
download | linux-15858fa5b00c1067a8a8e53ea32f4a65f8bebbb8.tar.xz linux-15858fa5b00c1067a8a8e53ea32f4a65f8bebbb8.zip |
md-cluster: Defer MD reloading to mddev->thread
Reloading of superblock must be performed under reconfig_mutex. However,
this cannot be done with md_reload_sb because it would deadlock with
the message DLM lock. So, we defer it in md_check_recovery() which is
executed by mddev->thread.
This introduces a new flag, MD_RELOAD_SB, which if set, will reload the
superblock. And good_device_nr is also added to 'struct mddev' which is
used to get the num of the good device within cluster raid.
Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.com>
Signed-off-by: Guoqing Jiang <gqjiang@suse.com>
Signed-off-by: NeilBrown <neilb@suse.com>
Diffstat (limited to 'drivers/md/md.h')
-rw-r--r-- | drivers/md/md.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/md/md.h b/drivers/md/md.h index f7b17aef837d..8817e623258a 100644 --- a/drivers/md/md.h +++ b/drivers/md/md.h @@ -235,6 +235,9 @@ struct mddev { */ #define MD_JOURNAL_CLEAN 5 /* A raid with journal is already clean */ #define MD_HAS_JOURNAL 6 /* The raid array has journal feature set */ +#define MD_RELOAD_SB 7 /* Reload the superblock because another node + * updated it. + */ int suspended; atomic_t active_io; @@ -465,6 +468,7 @@ struct mddev { struct work_struct event_work; /* used by dm to report failure event */ void (*sync_super)(struct mddev *mddev, struct md_rdev *rdev); struct md_cluster_info *cluster_info; + unsigned int good_device_nr; /* good device num within cluster raid */ }; static inline int __must_check mddev_lock(struct mddev *mddev) |